WATCH: Scenes, sounds of the Boston Marathon

More than 30,000 runners hit the streets of MetroWest and the Boston area April 17 for the 121st Boston Marathon.

Check out some of our best pictures from along the route from Hopkinton to Boston, including sounds collected on the course on Marathon Monday. You will hear announcer Brian Hoffman, Katherine Switzer - the first woman to enter and complete the Boston Marathon - and Chairman of the Chiefs of Staff Gen. Joseph Dunford of the United States Marine Corps welcoming runners in Hopkinton. You will also hear the cheers of the crowd in Framingham, the screams from the women of Wellesley College, music from the residents of Brookline as well as the crowds in Boston as runners complete 26.2 miles and cross the finish line on Boylston Street.